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1/*
2 USB Driver layer for GSM modems
3
4 Copyright (C) 2005 Matthias Urlichs <smurf@smurf.noris.de>
5
6 This driver is free software; you can redistribute it and/or modify
7 it under the terms of Version 2 of the GNU General Public License as
8 published by the Free Software Foundation.
9
10 Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
11
12 History: see the git log.
13
14 Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
15
16 This driver exists because the "normal" serial driver doesn't work too well
17 with GSM modems. Issues:
18 - data loss -- one single Receive URB is not nearly enough
19 - controlling the baud rate doesn't make sense
20*/
21
22#define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
23#define DRIVER_DESC "USB Driver for GSM modems"
24
25#include <linux/kernel.h>
26#include <linux/jiffies.h>
27#include <linux/errno.h>
28#include <linux/slab.h>
29#include <linux/tty.h>
30#include <linux/tty_flip.h>
31#include <linux/module.h>
32#include <linux/bitops.h>
33#include <linux/uaccess.h>
34#include <linux/usb.h>
35#include <linux/usb/serial.h>
36#include <linux/serial.h>
37#include "usb-wwan.h"
38
39/*
40 * Generate DTR/RTS signals on the port using the SET_CONTROL_LINE_STATE request
41 * in CDC ACM.
42 */
43static int usb_wwan_send_setup(struct usb_serial_port *port)
44{
45 struct usb_serial *serial = port->serial;
46 struct usb_wwan_port_private *portdata;
47 int val = 0;
48 int ifnum;
49 int res;
50
51 portdata = usb_get_serial_port_data(port);
52
53 if (portdata->dtr_state)
54 val |= 0x01;
55 if (portdata->rts_state)
56 val |= 0x02;
57
58 ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
59
60 res = usb_autopm_get_interface(serial->interface);
61 if (res)
62 return res;
63
64 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
65 0x22, 0x21, val, ifnum, NULL, 0,
66 USB_CTRL_SET_TIMEOUT);
67
68 usb_autopm_put_interface(port->serial->interface);
69
70 return res;
71}
72
73void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
74{
75 struct usb_wwan_port_private *portdata;
76 struct usb_wwan_intf_private *intfdata;
77
78 intfdata = usb_get_serial_data(port->serial);
79
80 if (!intfdata->use_send_setup)
81 return;
82
83 portdata = usb_get_serial_port_data(port);
84 /* FIXME: locking */
85 portdata->rts_state = on;
86 portdata->dtr_state = on;
87
88 usb_wwan_send_setup(port);
89}
90EXPORT_SYMBOL(usb_wwan_dtr_rts);
91
92int usb_wwan_tiocmget(struct tty_struct *tty)
93{
94 struct usb_serial_port *port = tty->driver_data;
95 unsigned int value;
96 struct usb_wwan_port_private *portdata;
97
98 portdata = usb_get_serial_port_data(port);
99
100 value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
101 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
102 ((portdata->cts_state) ? TIOCM_CTS : 0) |
103 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
104 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
105 ((portdata->ri_state) ? TIOCM_RNG : 0);
106
107 return value;
108}
109EXPORT_SYMBOL(usb_wwan_tiocmget);
110
111int usb_wwan_tiocmset(struct tty_struct *tty,
112 unsigned int set, unsigned int clear)
113{
114 struct usb_serial_port *port = tty->driver_data;
115 struct usb_wwan_port_private *portdata;
116 struct usb_wwan_intf_private *intfdata;
117
118 portdata = usb_get_serial_port_data(port);
119 intfdata = usb_get_serial_data(port->serial);
120
121 if (!intfdata->use_send_setup)
122 return -EINVAL;
123
124 /* FIXME: what locks portdata fields ? */
125 if (set & TIOCM_RTS)
126 portdata->rts_state = 1;
127 if (set & TIOCM_DTR)
128 portdata->dtr_state = 1;
129
130 if (clear & TIOCM_RTS)
131 portdata->rts_state = 0;
132 if (clear & TIOCM_DTR)
133 portdata->dtr_state = 0;
134 return usb_wwan_send_setup(port);
135}
136EXPORT_SYMBOL(usb_wwan_tiocmset);
137
138static int get_serial_info(struct usb_serial_port *port,
139 struct serial_struct __user *retinfo)
140{
141 struct serial_struct tmp;
142
143 if (!retinfo)
144 return -EFAULT;
145
146 memset(&tmp, 0, sizeof(tmp));
147 tmp.line = port->minor;
148 tmp.port = port->port_number;
149 tmp.baud_base = tty_get_baud_rate(port->port.tty);
150 tmp.close_delay = port->port.close_delay / 10;
151 tmp.closing_wait = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
152 ASYNC_CLOSING_WAIT_NONE :
153 port->port.closing_wait / 10;
154
155 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
156 return -EFAULT;
157 return 0;
158}
159
160static int set_serial_info(struct usb_serial_port *port,
161 struct serial_struct __user *newinfo)
162{
163 struct serial_struct new_serial;
164 unsigned int closing_wait, close_delay;
165 int retval = 0;
166
167 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
168 return -EFAULT;
169
170 close_delay = new_serial.close_delay * 10;
171 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
172 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
173
174 mutex_lock(&port->port.mutex);
175
176 if (!capable(CAP_SYS_ADMIN)) {
177 if ((close_delay != port->port.close_delay) ||
178 (closing_wait != port->port.closing_wait))
179 retval = -EPERM;
180 else
181 retval = -EOPNOTSUPP;
182 } else {
183 port->port.close_delay = close_delay;
184 port->port.closing_wait = closing_wait;
185 }
186
187 mutex_unlock(&port->port.mutex);
188 return retval;
189}
190
191int usb_wwan_ioctl(struct tty_struct *tty,
192 unsigned int cmd, unsigned long arg)
193{
194 struct usb_serial_port *port = tty->driver_data;
195
196 dev_dbg(&port->dev, "%s cmd 0x%04x\n", __func__, cmd);
197
198 switch (cmd) {
199 case TIOCGSERIAL:
200 return get_serial_info(port,
201 (struct serial_struct __user *) arg);
202 case TIOCSSERIAL:
203 return set_serial_info(port,
204 (struct serial_struct __user *) arg);
205 default:
206 break;
207 }
208
209 dev_dbg(&port->dev, "%s arg not supported\n", __func__);
210
211 return -ENOIOCTLCMD;
212}
213EXPORT_SYMBOL(usb_wwan_ioctl);
214
215int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
216 const unsigned char *buf, int count)
217{
218 struct usb_wwan_port_private *portdata;
219 struct usb_wwan_intf_private *intfdata;
220 int i;
221 int left, todo;
222 struct urb *this_urb = NULL; /* spurious */
223 int err;
224 unsigned long flags;
225
226 portdata = usb_get_serial_port_data(port);
227 intfdata = usb_get_serial_data(port->serial);
228
229 dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count);
230
231 i = 0;
232 left = count;
233 for (i = 0; left > 0 && i < N_OUT_URB; i++) {
234 todo = left;
235 if (todo > OUT_BUFLEN)
236 todo = OUT_BUFLEN;
237
238 this_urb = portdata->out_urbs[i];
239 if (test_and_set_bit(i, &portdata->out_busy)) {
240 if (time_before(jiffies,
241 portdata->tx_start_time[i] + 10 * HZ))
242 continue;
243 usb_unlink_urb(this_urb);
244 continue;
245 }
246 dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__,
247 usb_pipeendpoint(this_urb->pipe), i);
248
249 err = usb_autopm_get_interface_async(port->serial->interface);
250 if (err < 0) {
251 clear_bit(i, &portdata->out_busy);
252 break;
253 }
254
255 /* send the data */
256 memcpy(this_urb->transfer_buffer, buf, todo);
257 this_urb->transfer_buffer_length = todo;
258
259 spin_lock_irqsave(&intfdata->susp_lock, flags);
260 if (intfdata->suspended) {
261 usb_anchor_urb(this_urb, &portdata->delayed);
262 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
263 } else {
264 intfdata->in_flight++;
265 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
266 err = usb_submit_urb(this_urb, GFP_ATOMIC);
267 if (err) {
268 dev_err(&port->dev,
269 "%s: submit urb %d failed: %d\n",
270 __func__, i, err);
271 clear_bit(i, &portdata->out_busy);
272 spin_lock_irqsave(&intfdata->susp_lock, flags);
273 intfdata->in_flight--;
274 spin_unlock_irqrestore(&intfdata->susp_lock,
275 flags);
276 usb_autopm_put_interface_async(port->serial->interface);
277 break;
278 }
279 }
280
281 portdata->tx_start_time[i] = jiffies;
282 buf += todo;
283 left -= todo;
284 }
285
286 count -= left;
287 dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count);
288 return count;
289}
290EXPORT_SYMBOL(usb_wwan_write);
291
292static void usb_wwan_indat_callback(struct urb *urb)
293{
294 int err;
295 int endpoint;
296 struct usb_serial_port *port;
297 struct device *dev;
298 unsigned char *data = urb->transfer_buffer;
299 int status = urb->status;
300
301 endpoint = usb_pipeendpoint(urb->pipe);
302 port = urb->context;
303 dev = &port->dev;
304
305 if (status) {
306 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
307 __func__, status, endpoint);
308 } else {
309 if (urb->actual_length) {
310 tty_insert_flip_string(&port->port, data,
311 urb->actual_length);
312 tty_flip_buffer_push(&port->port);
313 } else
314 dev_dbg(dev, "%s: empty read urb received\n", __func__);
315 }
316 /* Resubmit urb so we continue receiving */
317 err = usb_submit_urb(urb, GFP_ATOMIC);
318 if (err) {
319 if (err != -EPERM && err != -ENODEV) {
320 dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
321 __func__, err);
322 /* busy also in error unless we are killed */
323 usb_mark_last_busy(port->serial->dev);
324 }
325 } else {
326 usb_mark_last_busy(port->serial->dev);
327 }
328}
329
330static void usb_wwan_outdat_callback(struct urb *urb)
331{
332 struct usb_serial_port *port;
333 struct usb_wwan_port_private *portdata;
334 struct usb_wwan_intf_private *intfdata;
335 int i;
336
337 port = urb->context;
338 intfdata = usb_get_serial_data(port->serial);
339
340 usb_serial_port_softint(port);
341 usb_autopm_put_interface_async(port->serial->interface);
342 portdata = usb_get_serial_port_data(port);
343 spin_lock(&intfdata->susp_lock);
344 intfdata->in_flight--;
345 spin_unlock(&intfdata->susp_lock);
346
347 for (i = 0; i < N_OUT_URB; ++i) {
348 if (portdata->out_urbs[i] == urb) {
349 smp_mb__before_atomic();
350 clear_bit(i, &portdata->out_busy);
351 break;
352 }
353 }
354}
355
356int usb_wwan_write_room(struct tty_struct *tty)
357{
358 struct usb_serial_port *port = tty->driver_data;
359 struct usb_wwan_port_private *portdata;
360 int i;
361 int data_len = 0;
362 struct urb *this_urb;
363
364 portdata = usb_get_serial_port_data(port);
365
366 for (i = 0; i < N_OUT_URB; i++) {
367 this_urb = portdata->out_urbs[i];
368 if (this_urb && !test_bit(i, &portdata->out_busy))
369 data_len += OUT_BUFLEN;
370 }
371
372 dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
373 return data_len;
374}
375EXPORT_SYMBOL(usb_wwan_write_room);
376
377int usb_wwan_chars_in_buffer(struct tty_struct *tty)
378{
379 struct usb_serial_port *port = tty->driver_data;
380 struct usb_wwan_port_private *portdata;
381 int i;
382 int data_len = 0;
383 struct urb *this_urb;
384
385 portdata = usb_get_serial_port_data(port);
386
387 for (i = 0; i < N_OUT_URB; i++) {
388 this_urb = portdata->out_urbs[i];
389 /* FIXME: This locking is insufficient as this_urb may
390 go unused during the test */
391 if (this_urb && test_bit(i, &portdata->out_busy))
392 data_len += this_urb->transfer_buffer_length;
393 }
394 dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
395 return data_len;
396}
397EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
398
399int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
400{
401 struct usb_wwan_port_private *portdata;
402 struct usb_wwan_intf_private *intfdata;
403 struct usb_serial *serial = port->serial;
404 int i, err;
405 struct urb *urb;
406
407 portdata = usb_get_serial_port_data(port);
408 intfdata = usb_get_serial_data(serial);
409
410 if (port->interrupt_in_urb) {
411 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
412 if (err) {
413 dev_err(&port->dev, "%s: submit int urb failed: %d\n",
414 __func__, err);
415 }
416 }
417
418 /* Start reading from the IN endpoint */
419 for (i = 0; i < N_IN_URB; i++) {
420 urb = portdata->in_urbs[i];
421 if (!urb)
422 continue;
423 err = usb_submit_urb(urb, GFP_KERNEL);
424 if (err) {
425 dev_err(&port->dev,
426 "%s: submit read urb %d failed: %d\n",
427 __func__, i, err);
428 }
429 }
430
431 spin_lock_irq(&intfdata->susp_lock);
432 if (++intfdata->open_ports == 1)
433 serial->interface->needs_remote_wakeup = 1;
434 spin_unlock_irq(&intfdata->susp_lock);
435 /* this balances a get in the generic USB serial code */
436 usb_autopm_put_interface(serial->interface);
437
438 return 0;
439}
440EXPORT_SYMBOL(usb_wwan_open);
441
442static void unbusy_queued_urb(struct urb *urb,
443 struct usb_wwan_port_private *portdata)
444{
445 int i;
446
447 for (i = 0; i < N_OUT_URB; i++) {
448 if (urb == portdata->out_urbs[i]) {
449 clear_bit(i, &portdata->out_busy);
450 break;
451 }
452 }
453}
454
455void usb_wwan_close(struct usb_serial_port *port)
456{
457 int i;
458 struct usb_serial *serial = port->serial;
459 struct usb_wwan_port_private *portdata;
460 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
461 struct urb *urb;
462
463 portdata = usb_get_serial_port_data(port);
464
465 /*
466 * Need to take susp_lock to make sure port is not already being
467 * resumed, but no need to hold it due to ASYNC_INITIALIZED.
468 */
469 spin_lock_irq(&intfdata->susp_lock);
470 if (--intfdata->open_ports == 0)
471 serial->interface->needs_remote_wakeup = 0;
472 spin_unlock_irq(&intfdata->susp_lock);
473
474 for (;;) {
475 urb = usb_get_from_anchor(&portdata->delayed);
476 if (!urb)
477 break;
478 unbusy_queued_urb(urb, portdata);
479 usb_autopm_put_interface_async(serial->interface);
480 }
481
482 for (i = 0; i < N_IN_URB; i++)
483 usb_kill_urb(portdata->in_urbs[i]);
484 for (i = 0; i < N_OUT_URB; i++)
485 usb_kill_urb(portdata->out_urbs[i]);
486 usb_kill_urb(port->interrupt_in_urb);
487
488 usb_autopm_get_interface_no_resume(serial->interface);
489}
490EXPORT_SYMBOL(usb_wwan_close);
491
492static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
493 int endpoint,
494 int dir, void *ctx, char *buf, int len,
495 void (*callback) (struct urb *))
496{
497 struct usb_serial *serial = port->serial;
498 struct urb *urb;
499
500 urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
501 if (!urb)
502 return NULL;
503
504 usb_fill_bulk_urb(urb, serial->dev,
505 usb_sndbulkpipe(serial->dev, endpoint) | dir,
506 buf, len, callback, ctx);
507
508 return urb;
509}
510
511int usb_wwan_port_probe(struct usb_serial_port *port)
512{
513 struct usb_wwan_port_private *portdata;
514 struct urb *urb;
515 u8 *buffer;
516 int i;
517
518 if (!port->bulk_in_size || !port->bulk_out_size)
519 return -ENODEV;
520
521 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
522 if (!portdata)
523 return -ENOMEM;
524
525 init_usb_anchor(&portdata->delayed);
526
527 for (i = 0; i < N_IN_URB; i++) {
528 buffer = (u8 *)__get_free_page(GFP_KERNEL);
529 if (!buffer)
530 goto bail_out_error;
531 portdata->in_buffer[i] = buffer;
532
533 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
534 USB_DIR_IN, port,
535 buffer, IN_BUFLEN,
536 usb_wwan_indat_callback);
537 portdata->in_urbs[i] = urb;
538 }
539
540 for (i = 0; i < N_OUT_URB; i++) {
541 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
542 if (!buffer)
543 goto bail_out_error2;
544 portdata->out_buffer[i] = buffer;
545
546 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
547 USB_DIR_OUT, port,
548 buffer, OUT_BUFLEN,
549 usb_wwan_outdat_callback);
550 portdata->out_urbs[i] = urb;
551 }
552
553 usb_set_serial_port_data(port, portdata);
554
555 return 0;
556
557bail_out_error2:
558 for (i = 0; i < N_OUT_URB; i++) {
559 usb_free_urb(portdata->out_urbs[i]);
560 kfree(portdata->out_buffer[i]);
561 }
562bail_out_error:
563 for (i = 0; i < N_IN_URB; i++) {
564 usb_free_urb(portdata->in_urbs[i]);
565 free_page((unsigned long)portdata->in_buffer[i]);
566 }
567 kfree(portdata);
568
569 return -ENOMEM;
570}
571EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
572
573int usb_wwan_port_remove(struct usb_serial_port *port)
574{
575 int i;
576 struct usb_wwan_port_private *portdata;
577
578 portdata = usb_get_serial_port_data(port);
579 usb_set_serial_port_data(port, NULL);
580
581 for (i = 0; i < N_IN_URB; i++) {
582 usb_free_urb(portdata->in_urbs[i]);
583 free_page((unsigned long)portdata->in_buffer[i]);
584 }
585 for (i = 0; i < N_OUT_URB; i++) {
586 usb_free_urb(portdata->out_urbs[i]);
587 kfree(portdata->out_buffer[i]);
588 }
589
590 kfree(portdata);
591
592 return 0;
593}
594EXPORT_SYMBOL(usb_wwan_port_remove);
595
596#ifdef CONFIG_PM
597static void stop_urbs(struct usb_serial *serial)
598{
599 int i, j;
600 struct usb_serial_port *port;
601 struct usb_wwan_port_private *portdata;
602
603 for (i = 0; i < serial->num_ports; ++i) {
604 port = serial->port[i];
605 portdata = usb_get_serial_port_data(port);
606 if (!portdata)
607 continue;
608 for (j = 0; j < N_IN_URB; j++)
609 usb_kill_urb(portdata->in_urbs[j]);
610 for (j = 0; j < N_OUT_URB; j++)
611 usb_kill_urb(portdata->out_urbs[j]);
612 usb_kill_urb(port->interrupt_in_urb);
613 }
614}
615
616int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
617{
618 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
619
620 spin_lock_irq(&intfdata->susp_lock);
621 if (PMSG_IS_AUTO(message)) {
622 if (intfdata->in_flight) {
623 spin_unlock_irq(&intfdata->susp_lock);
624 return -EBUSY;
625 }
626 }
627 intfdata->suspended = 1;
628 spin_unlock_irq(&intfdata->susp_lock);
629
630 stop_urbs(serial);
631
632 return 0;
633}
634EXPORT_SYMBOL(usb_wwan_suspend);
635
636/* Caller must hold susp_lock. */
637static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port)
638{
639 struct usb_serial *serial = port->serial;
640 struct usb_wwan_intf_private *data = usb_get_serial_data(serial);
641 struct usb_wwan_port_private *portdata;
642 struct urb *urb;
643 int err_count = 0;
644 int err;
645
646 portdata = usb_get_serial_port_data(port);
647
648 for (;;) {
649 urb = usb_get_from_anchor(&portdata->delayed);
650 if (!urb)
651 break;
652
653 err = usb_submit_urb(urb, GFP_ATOMIC);
654 if (err) {
655 dev_err(&port->dev, "%s: submit urb failed: %d\n",
656 __func__, err);
657 err_count++;
658 unbusy_queued_urb(urb, portdata);
659 usb_autopm_put_interface_async(serial->interface);
660 continue;
661 }
662 data->in_flight++;
663 }
664
665 if (err_count)
666 return -EIO;
667
668 return 0;
669}
670
671int usb_wwan_resume(struct usb_serial *serial)
672{
673 int i, j;
674 struct usb_serial_port *port;
675 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
676 struct usb_wwan_port_private *portdata;
677 struct urb *urb;
678 int err;
679 int err_count = 0;
680
681 spin_lock_irq(&intfdata->susp_lock);
682 for (i = 0; i < serial->num_ports; i++) {
683 port = serial->port[i];
684
685 if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags))
686 continue;
687
688 portdata = usb_get_serial_port_data(port);
689
690 if (port->interrupt_in_urb) {
691 err = usb_submit_urb(port->interrupt_in_urb,
692 GFP_ATOMIC);
693 if (err) {
694 dev_err(&port->dev,
695 "%s: submit int urb failed: %d\n",
696 __func__, err);
697 err_count++;
698 }
699 }
700
701 err = usb_wwan_submit_delayed_urbs(port);
702 if (err)
703 err_count++;
704
705 for (j = 0; j < N_IN_URB; j++) {
706 urb = portdata->in_urbs[j];
707 err = usb_submit_urb(urb, GFP_ATOMIC);
708 if (err < 0) {
709 dev_err(&port->dev,
710 "%s: submit read urb %d failed: %d\n",
711 __func__, i, err);
712 err_count++;
713 }
714 }
715 }
716 intfdata->suspended = 0;
717 spin_unlock_irq(&intfdata->susp_lock);
718
719 if (err_count)
720 return -EIO;
721
722 return 0;
723}
724EXPORT_SYMBOL(usb_wwan_resume);
725#endif
726
727MODULE_AUTHOR(DRIVER_AUTHOR);
728MODULE_DESCRIPTION(DRIVER_DESC);
729MODULE_LICENSE("GPL");
1/*
2 USB Driver layer for GSM modems
3
4 Copyright (C) 2005 Matthias Urlichs <smurf@smurf.noris.de>
5
6 This driver is free software; you can redistribute it and/or modify
7 it under the terms of Version 2 of the GNU General Public License as
8 published by the Free Software Foundation.
9
10 Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
11
12 History: see the git log.
13
14 Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
15
16 This driver exists because the "normal" serial driver doesn't work too well
17 with GSM modems. Issues:
18 - data loss -- one single Receive URB is not nearly enough
19 - controlling the baud rate doesn't make sense
20*/
21
22#define DRIVER_VERSION "v0.7.2"
23#define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
24#define DRIVER_DESC "USB Driver for GSM modems"
25
26#include <linux/kernel.h>
27#include <linux/jiffies.h>
28#include <linux/errno.h>
29#include <linux/slab.h>
30#include <linux/tty.h>
31#include <linux/tty_flip.h>
32#include <linux/module.h>
33#include <linux/bitops.h>
34#include <linux/uaccess.h>
35#include <linux/usb.h>
36#include <linux/usb/serial.h>
37#include <linux/serial.h>
38#include "usb-wwan.h"
39
40static bool debug;
41
42void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
43{
44 struct usb_serial *serial = port->serial;
45 struct usb_wwan_port_private *portdata;
46 struct usb_wwan_intf_private *intfdata;
47
48 intfdata = port->serial->private;
49
50 if (!intfdata->send_setup)
51 return;
52
53 portdata = usb_get_serial_port_data(port);
54 mutex_lock(&serial->disc_mutex);
55 portdata->rts_state = on;
56 portdata->dtr_state = on;
57 if (serial->dev)
58 intfdata->send_setup(port);
59 mutex_unlock(&serial->disc_mutex);
60}
61EXPORT_SYMBOL(usb_wwan_dtr_rts);
62
63void usb_wwan_set_termios(struct tty_struct *tty,
64 struct usb_serial_port *port,
65 struct ktermios *old_termios)
66{
67 struct usb_wwan_intf_private *intfdata = port->serial->private;
68
69 /* Doesn't support option setting */
70 tty_termios_copy_hw(tty->termios, old_termios);
71
72 if (intfdata->send_setup)
73 intfdata->send_setup(port);
74}
75EXPORT_SYMBOL(usb_wwan_set_termios);
76
77int usb_wwan_tiocmget(struct tty_struct *tty)
78{
79 struct usb_serial_port *port = tty->driver_data;
80 unsigned int value;
81 struct usb_wwan_port_private *portdata;
82
83 portdata = usb_get_serial_port_data(port);
84
85 value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
86 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
87 ((portdata->cts_state) ? TIOCM_CTS : 0) |
88 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
89 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
90 ((portdata->ri_state) ? TIOCM_RNG : 0);
91
92 return value;
93}
94EXPORT_SYMBOL(usb_wwan_tiocmget);
95
96int usb_wwan_tiocmset(struct tty_struct *tty,
97 unsigned int set, unsigned int clear)
98{
99 struct usb_serial_port *port = tty->driver_data;
100 struct usb_wwan_port_private *portdata;
101 struct usb_wwan_intf_private *intfdata;
102
103 portdata = usb_get_serial_port_data(port);
104 intfdata = port->serial->private;
105
106 if (!intfdata->send_setup)
107 return -EINVAL;
108
109 /* FIXME: what locks portdata fields ? */
110 if (set & TIOCM_RTS)
111 portdata->rts_state = 1;
112 if (set & TIOCM_DTR)
113 portdata->dtr_state = 1;
114
115 if (clear & TIOCM_RTS)
116 portdata->rts_state = 0;
117 if (clear & TIOCM_DTR)
118 portdata->dtr_state = 0;
119 return intfdata->send_setup(port);
120}
121EXPORT_SYMBOL(usb_wwan_tiocmset);
122
123static int get_serial_info(struct usb_serial_port *port,
124 struct serial_struct __user *retinfo)
125{
126 struct serial_struct tmp;
127
128 if (!retinfo)
129 return -EFAULT;
130
131 memset(&tmp, 0, sizeof(tmp));
132 tmp.line = port->serial->minor;
133 tmp.port = port->number;
134 tmp.baud_base = tty_get_baud_rate(port->port.tty);
135 tmp.close_delay = port->port.close_delay / 10;
136 tmp.closing_wait = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
137 ASYNC_CLOSING_WAIT_NONE :
138 port->port.closing_wait / 10;
139
140 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
141 return -EFAULT;
142 return 0;
143}
144
145static int set_serial_info(struct usb_serial_port *port,
146 struct serial_struct __user *newinfo)
147{
148 struct serial_struct new_serial;
149 unsigned int closing_wait, close_delay;
150 int retval = 0;
151
152 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
153 return -EFAULT;
154
155 close_delay = new_serial.close_delay * 10;
156 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
157 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
158
159 mutex_lock(&port->port.mutex);
160
161 if (!capable(CAP_SYS_ADMIN)) {
162 if ((close_delay != port->port.close_delay) ||
163 (closing_wait != port->port.closing_wait))
164 retval = -EPERM;
165 else
166 retval = -EOPNOTSUPP;
167 } else {
168 port->port.close_delay = close_delay;
169 port->port.closing_wait = closing_wait;
170 }
171
172 mutex_unlock(&port->port.mutex);
173 return retval;
174}
175
176int usb_wwan_ioctl(struct tty_struct *tty,
177 unsigned int cmd, unsigned long arg)
178{
179 struct usb_serial_port *port = tty->driver_data;
180
181 dbg("%s cmd 0x%04x", __func__, cmd);
182
183 switch (cmd) {
184 case TIOCGSERIAL:
185 return get_serial_info(port,
186 (struct serial_struct __user *) arg);
187 case TIOCSSERIAL:
188 return set_serial_info(port,
189 (struct serial_struct __user *) arg);
190 default:
191 break;
192 }
193
194 dbg("%s arg not supported", __func__);
195
196 return -ENOIOCTLCMD;
197}
198EXPORT_SYMBOL(usb_wwan_ioctl);
199
200/* Write */
201int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
202 const unsigned char *buf, int count)
203{
204 struct usb_wwan_port_private *portdata;
205 struct usb_wwan_intf_private *intfdata;
206 int i;
207 int left, todo;
208 struct urb *this_urb = NULL; /* spurious */
209 int err;
210 unsigned long flags;
211
212 portdata = usb_get_serial_port_data(port);
213 intfdata = port->serial->private;
214
215 dbg("%s: write (%d chars)", __func__, count);
216
217 i = 0;
218 left = count;
219 for (i = 0; left > 0 && i < N_OUT_URB; i++) {
220 todo = left;
221 if (todo > OUT_BUFLEN)
222 todo = OUT_BUFLEN;
223
224 this_urb = portdata->out_urbs[i];
225 if (test_and_set_bit(i, &portdata->out_busy)) {
226 if (time_before(jiffies,
227 portdata->tx_start_time[i] + 10 * HZ))
228 continue;
229 usb_unlink_urb(this_urb);
230 continue;
231 }
232 dbg("%s: endpoint %d buf %d", __func__,
233 usb_pipeendpoint(this_urb->pipe), i);
234
235 err = usb_autopm_get_interface_async(port->serial->interface);
236 if (err < 0)
237 break;
238
239 /* send the data */
240 memcpy(this_urb->transfer_buffer, buf, todo);
241 this_urb->transfer_buffer_length = todo;
242
243 spin_lock_irqsave(&intfdata->susp_lock, flags);
244 if (intfdata->suspended) {
245 usb_anchor_urb(this_urb, &portdata->delayed);
246 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
247 } else {
248 intfdata->in_flight++;
249 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
250 err = usb_submit_urb(this_urb, GFP_ATOMIC);
251 if (err) {
252 dbg("usb_submit_urb %p (write bulk) failed "
253 "(%d)", this_urb, err);
254 clear_bit(i, &portdata->out_busy);
255 spin_lock_irqsave(&intfdata->susp_lock, flags);
256 intfdata->in_flight--;
257 spin_unlock_irqrestore(&intfdata->susp_lock,
258 flags);
259 usb_autopm_put_interface_async(port->serial->interface);
260 break;
261 }
262 }
263
264 portdata->tx_start_time[i] = jiffies;
265 buf += todo;
266 left -= todo;
267 }
268
269 count -= left;
270 dbg("%s: wrote (did %d)", __func__, count);
271 return count;
272}
273EXPORT_SYMBOL(usb_wwan_write);
274
275static void usb_wwan_indat_callback(struct urb *urb)
276{
277 int err;
278 int endpoint;
279 struct usb_serial_port *port;
280 struct tty_struct *tty;
281 unsigned char *data = urb->transfer_buffer;
282 int status = urb->status;
283
284 endpoint = usb_pipeendpoint(urb->pipe);
285 port = urb->context;
286
287 if (status) {
288 dbg("%s: nonzero status: %d on endpoint %02x.",
289 __func__, status, endpoint);
290 } else {
291 tty = tty_port_tty_get(&port->port);
292 if (tty) {
293 if (urb->actual_length) {
294 tty_insert_flip_string(tty, data,
295 urb->actual_length);
296 tty_flip_buffer_push(tty);
297 } else
298 dbg("%s: empty read urb received", __func__);
299 tty_kref_put(tty);
300 }
301
302 /* Resubmit urb so we continue receiving */
303 err = usb_submit_urb(urb, GFP_ATOMIC);
304 if (err) {
305 if (err != -EPERM) {
306 printk(KERN_ERR "%s: resubmit read urb failed. "
307 "(%d)", __func__, err);
308 /* busy also in error unless we are killed */
309 usb_mark_last_busy(port->serial->dev);
310 }
311 } else {
312 usb_mark_last_busy(port->serial->dev);
313 }
314 }
315}
316
317static void usb_wwan_outdat_callback(struct urb *urb)
318{
319 struct usb_serial_port *port;
320 struct usb_wwan_port_private *portdata;
321 struct usb_wwan_intf_private *intfdata;
322 int i;
323
324 port = urb->context;
325 intfdata = port->serial->private;
326
327 usb_serial_port_softint(port);
328 usb_autopm_put_interface_async(port->serial->interface);
329 portdata = usb_get_serial_port_data(port);
330 spin_lock(&intfdata->susp_lock);
331 intfdata->in_flight--;
332 spin_unlock(&intfdata->susp_lock);
333
334 for (i = 0; i < N_OUT_URB; ++i) {
335 if (portdata->out_urbs[i] == urb) {
336 smp_mb__before_clear_bit();
337 clear_bit(i, &portdata->out_busy);
338 break;
339 }
340 }
341}
342
343int usb_wwan_write_room(struct tty_struct *tty)
344{
345 struct usb_serial_port *port = tty->driver_data;
346 struct usb_wwan_port_private *portdata;
347 int i;
348 int data_len = 0;
349 struct urb *this_urb;
350
351 portdata = usb_get_serial_port_data(port);
352
353 for (i = 0; i < N_OUT_URB; i++) {
354 this_urb = portdata->out_urbs[i];
355 if (this_urb && !test_bit(i, &portdata->out_busy))
356 data_len += OUT_BUFLEN;
357 }
358
359 dbg("%s: %d", __func__, data_len);
360 return data_len;
361}
362EXPORT_SYMBOL(usb_wwan_write_room);
363
364int usb_wwan_chars_in_buffer(struct tty_struct *tty)
365{
366 struct usb_serial_port *port = tty->driver_data;
367 struct usb_wwan_port_private *portdata;
368 int i;
369 int data_len = 0;
370 struct urb *this_urb;
371
372 portdata = usb_get_serial_port_data(port);
373
374 for (i = 0; i < N_OUT_URB; i++) {
375 this_urb = portdata->out_urbs[i];
376 /* FIXME: This locking is insufficient as this_urb may
377 go unused during the test */
378 if (this_urb && test_bit(i, &portdata->out_busy))
379 data_len += this_urb->transfer_buffer_length;
380 }
381 dbg("%s: %d", __func__, data_len);
382 return data_len;
383}
384EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
385
386int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
387{
388 struct usb_wwan_port_private *portdata;
389 struct usb_wwan_intf_private *intfdata;
390 struct usb_serial *serial = port->serial;
391 int i, err;
392 struct urb *urb;
393
394 portdata = usb_get_serial_port_data(port);
395 intfdata = serial->private;
396
397 /* Start reading from the IN endpoint */
398 for (i = 0; i < N_IN_URB; i++) {
399 urb = portdata->in_urbs[i];
400 if (!urb)
401 continue;
402 err = usb_submit_urb(urb, GFP_KERNEL);
403 if (err) {
404 dbg("%s: submit urb %d failed (%d) %d",
405 __func__, i, err, urb->transfer_buffer_length);
406 }
407 }
408
409 if (intfdata->send_setup)
410 intfdata->send_setup(port);
411
412 serial->interface->needs_remote_wakeup = 1;
413 spin_lock_irq(&intfdata->susp_lock);
414 portdata->opened = 1;
415 spin_unlock_irq(&intfdata->susp_lock);
416 /* this balances a get in the generic USB serial code */
417 usb_autopm_put_interface(serial->interface);
418
419 return 0;
420}
421EXPORT_SYMBOL(usb_wwan_open);
422
423void usb_wwan_close(struct usb_serial_port *port)
424{
425 int i;
426 struct usb_serial *serial = port->serial;
427 struct usb_wwan_port_private *portdata;
428 struct usb_wwan_intf_private *intfdata = port->serial->private;
429
430 portdata = usb_get_serial_port_data(port);
431
432 if (serial->dev) {
433 /* Stop reading/writing urbs */
434 spin_lock_irq(&intfdata->susp_lock);
435 portdata->opened = 0;
436 spin_unlock_irq(&intfdata->susp_lock);
437
438 for (i = 0; i < N_IN_URB; i++)
439 usb_kill_urb(portdata->in_urbs[i]);
440 for (i = 0; i < N_OUT_URB; i++)
441 usb_kill_urb(portdata->out_urbs[i]);
442 /* balancing - important as an error cannot be handled*/
443 usb_autopm_get_interface_no_resume(serial->interface);
444 serial->interface->needs_remote_wakeup = 0;
445 }
446}
447EXPORT_SYMBOL(usb_wwan_close);
448
449/* Helper functions used by usb_wwan_setup_urbs */
450static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
451 int dir, void *ctx, char *buf, int len,
452 void (*callback) (struct urb *))
453{
454 struct urb *urb;
455
456 if (endpoint == -1)
457 return NULL; /* endpoint not needed */
458
459 urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
460 if (urb == NULL) {
461 dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
462 return NULL;
463 }
464
465 /* Fill URB using supplied data. */
466 usb_fill_bulk_urb(urb, serial->dev,
467 usb_sndbulkpipe(serial->dev, endpoint) | dir,
468 buf, len, callback, ctx);
469
470 return urb;
471}
472
473/* Setup urbs */
474static void usb_wwan_setup_urbs(struct usb_serial *serial)
475{
476 int i, j;
477 struct usb_serial_port *port;
478 struct usb_wwan_port_private *portdata;
479
480 for (i = 0; i < serial->num_ports; i++) {
481 port = serial->port[i];
482 portdata = usb_get_serial_port_data(port);
483
484 /* Do indat endpoints first */
485 for (j = 0; j < N_IN_URB; ++j) {
486 portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
487 port->
488 bulk_in_endpointAddress,
489 USB_DIR_IN,
490 port,
491 portdata->
492 in_buffer[j],
493 IN_BUFLEN,
494 usb_wwan_indat_callback);
495 }
496
497 /* outdat endpoints */
498 for (j = 0; j < N_OUT_URB; ++j) {
499 portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
500 port->
501 bulk_out_endpointAddress,
502 USB_DIR_OUT,
503 port,
504 portdata->
505 out_buffer
506 [j],
507 OUT_BUFLEN,
508 usb_wwan_outdat_callback);
509 }
510 }
511}
512
513int usb_wwan_startup(struct usb_serial *serial)
514{
515 int i, j, err;
516 struct usb_serial_port *port;
517 struct usb_wwan_port_private *portdata;
518 u8 *buffer;
519
520 /* Now setup per port private data */
521 for (i = 0; i < serial->num_ports; i++) {
522 port = serial->port[i];
523 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
524 if (!portdata) {
525 dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
526 __func__, i);
527 return 1;
528 }
529 init_usb_anchor(&portdata->delayed);
530
531 for (j = 0; j < N_IN_URB; j++) {
532 buffer = (u8 *) __get_free_page(GFP_KERNEL);
533 if (!buffer)
534 goto bail_out_error;
535 portdata->in_buffer[j] = buffer;
536 }
537
538 for (j = 0; j < N_OUT_URB; j++) {
539 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
540 if (!buffer)
541 goto bail_out_error2;
542 portdata->out_buffer[j] = buffer;
543 }
544
545 usb_set_serial_port_data(port, portdata);
546
547 if (!port->interrupt_in_urb)
548 continue;
549 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
550 if (err)
551 dbg("%s: submit irq_in urb failed %d", __func__, err);
552 }
553 usb_wwan_setup_urbs(serial);
554 return 0;
555
556bail_out_error2:
557 for (j = 0; j < N_OUT_URB; j++)
558 kfree(portdata->out_buffer[j]);
559bail_out_error:
560 for (j = 0; j < N_IN_URB; j++)
561 if (portdata->in_buffer[j])
562 free_page((unsigned long)portdata->in_buffer[j]);
563 kfree(portdata);
564 return 1;
565}
566EXPORT_SYMBOL(usb_wwan_startup);
567
568static void stop_read_write_urbs(struct usb_serial *serial)
569{
570 int i, j;
571 struct usb_serial_port *port;
572 struct usb_wwan_port_private *portdata;
573
574 /* Stop reading/writing urbs */
575 for (i = 0; i < serial->num_ports; ++i) {
576 port = serial->port[i];
577 portdata = usb_get_serial_port_data(port);
578 for (j = 0; j < N_IN_URB; j++)
579 usb_kill_urb(portdata->in_urbs[j]);
580 for (j = 0; j < N_OUT_URB; j++)
581 usb_kill_urb(portdata->out_urbs[j]);
582 }
583}
584
585void usb_wwan_disconnect(struct usb_serial *serial)
586{
587 stop_read_write_urbs(serial);
588}
589EXPORT_SYMBOL(usb_wwan_disconnect);
590
591void usb_wwan_release(struct usb_serial *serial)
592{
593 int i, j;
594 struct usb_serial_port *port;
595 struct usb_wwan_port_private *portdata;
596
597 /* Now free them */
598 for (i = 0; i < serial->num_ports; ++i) {
599 port = serial->port[i];
600 portdata = usb_get_serial_port_data(port);
601
602 for (j = 0; j < N_IN_URB; j++) {
603 usb_free_urb(portdata->in_urbs[j]);
604 free_page((unsigned long)
605 portdata->in_buffer[j]);
606 portdata->in_urbs[j] = NULL;
607 }
608 for (j = 0; j < N_OUT_URB; j++) {
609 usb_free_urb(portdata->out_urbs[j]);
610 kfree(portdata->out_buffer[j]);
611 portdata->out_urbs[j] = NULL;
612 }
613 }
614
615 /* Now free per port private data */
616 for (i = 0; i < serial->num_ports; i++) {
617 port = serial->port[i];
618 kfree(usb_get_serial_port_data(port));
619 }
620}
621EXPORT_SYMBOL(usb_wwan_release);
622
623#ifdef CONFIG_PM
624int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
625{
626 struct usb_wwan_intf_private *intfdata = serial->private;
627 int b;
628
629 if (PMSG_IS_AUTO(message)) {
630 spin_lock_irq(&intfdata->susp_lock);
631 b = intfdata->in_flight;
632 spin_unlock_irq(&intfdata->susp_lock);
633
634 if (b)
635 return -EBUSY;
636 }
637
638 spin_lock_irq(&intfdata->susp_lock);
639 intfdata->suspended = 1;
640 spin_unlock_irq(&intfdata->susp_lock);
641 stop_read_write_urbs(serial);
642
643 return 0;
644}
645EXPORT_SYMBOL(usb_wwan_suspend);
646
647static void unbusy_queued_urb(struct urb *urb, struct usb_wwan_port_private *portdata)
648{
649 int i;
650
651 for (i = 0; i < N_OUT_URB; i++) {
652 if (urb == portdata->out_urbs[i]) {
653 clear_bit(i, &portdata->out_busy);
654 break;
655 }
656 }
657}
658
659static void play_delayed(struct usb_serial_port *port)
660{
661 struct usb_wwan_intf_private *data;
662 struct usb_wwan_port_private *portdata;
663 struct urb *urb;
664 int err;
665
666 portdata = usb_get_serial_port_data(port);
667 data = port->serial->private;
668 while ((urb = usb_get_from_anchor(&portdata->delayed))) {
669 err = usb_submit_urb(urb, GFP_ATOMIC);
670 if (!err) {
671 data->in_flight++;
672 } else {
673 /* we have to throw away the rest */
674 do {
675 unbusy_queued_urb(urb, portdata);
676 usb_autopm_put_interface_no_suspend(port->serial->interface);
677 } while ((urb = usb_get_from_anchor(&portdata->delayed)));
678 break;
679 }
680 }
681}
682
683int usb_wwan_resume(struct usb_serial *serial)
684{
685 int i, j;
686 struct usb_serial_port *port;
687 struct usb_wwan_intf_private *intfdata = serial->private;
688 struct usb_wwan_port_private *portdata;
689 struct urb *urb;
690 int err = 0;
691
692 /* get the interrupt URBs resubmitted unconditionally */
693 for (i = 0; i < serial->num_ports; i++) {
694 port = serial->port[i];
695 if (!port->interrupt_in_urb) {
696 dbg("%s: No interrupt URB for port %d", __func__, i);
697 continue;
698 }
699 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
700 dbg("Submitted interrupt URB for port %d (result %d)", i, err);
701 if (err < 0) {
702 dev_err(&port->dev, "%s: Error %d for interrupt URB\n",
703 __func__, err);
704 goto err_out;
705 }
706 }
707
708 for (i = 0; i < serial->num_ports; i++) {
709 /* walk all ports */
710 port = serial->port[i];
711 portdata = usb_get_serial_port_data(port);
712
713 /* skip closed ports */
714 spin_lock_irq(&intfdata->susp_lock);
715 if (!portdata->opened) {
716 spin_unlock_irq(&intfdata->susp_lock);
717 continue;
718 }
719
720 for (j = 0; j < N_IN_URB; j++) {
721 urb = portdata->in_urbs[j];
722 err = usb_submit_urb(urb, GFP_ATOMIC);
723 if (err < 0) {
724 dev_err(&port->dev, "%s: Error %d for bulk URB %d\n",
725 __func__, err, i);
726 spin_unlock_irq(&intfdata->susp_lock);
727 goto err_out;
728 }
729 }
730 play_delayed(port);
731 spin_unlock_irq(&intfdata->susp_lock);
732 }
733 spin_lock_irq(&intfdata->susp_lock);
734 intfdata->suspended = 0;
735 spin_unlock_irq(&intfdata->susp_lock);
736err_out:
737 return err;
738}
739EXPORT_SYMBOL(usb_wwan_resume);
740#endif
741
742MODULE_AUTHOR(DRIVER_AUTHOR);
743MODULE_DESCRIPTION(DRIVER_DESC);
744MODULE_VERSION(DRIVER_VERSION);
745MODULE_LICENSE("GPL");
746
747module_param(debug, bool, S_IRUGO | S_IWUSR);
748MODULE_PARM_DESC(debug, "Debug messages");